Scientifically how does a torch work

Question 2 State any two dangers of electricity if handles carelessly? Question 3 State few uses of electricity? Question 4 Name few gadgets which use electricity for their working?

Question 5 Explain why we should never join the two terminals of a cell by wire only? Question 6 Draw the sketch of a torch bulb? Question 7 What is a dry cell? Explain the construction of dry cell? Question 8 Which part of the torch bulb gives off light when it is connected to a cell by wires? Electricity is useful because it can be converted easily into various other forms of energy such heat energy, light energy ,mechanical energy, sound energy and magnetism.

We use electricity to run many appliances in our day to day life which makes our work easier. For example:. Electricity can also be very dangerous. If electric wires and electrical appliances are handled carelessly, then a person can get electric shock which may cause severe burns and even death. Improper handling of electricity can also cause fires. A danger sign is usually displayed on electric poles, electric substations, electric transformers and many other places to warn the people that they should not come in contact with them because electricity can be very dangerous.

We should never use electricity from power points or sockets in our homes or school for performing science experiments because it is very unsafe and dangerous to do so. We can use an electric cell to get electricity that is safe for performing experiment. An electric cell is known as dry cell or cell. A cell provides much less electricity than that provided by power stations. A single electric cell usually provides only 1. If two or more cells are joined together, they make a battery.

Cells and batteries are available in the market in different shapes and sizes depending on their use. In order to get electricity from a cell or battery we have to connect it into a circuit. An electric cell is a device which produces a small amount of electricity. Electric cell is a source of safe electricity as well as portable electricity.

The electric cell which we use in torch is known as dry cell. It is called dry cell because it does not contain any liquid chemical. The electric cell is a cylindrical device having a small metal cap on one side and a metal disc on the other side.

The electric cell has two terminals: a positive terminal and negative terminal. The metal cap is positive terminal of the electric cell whereas metal disc is the negative terminal of the electric cell. The electric cell produces electricity from the chemicals stored inside it.

When all the chemicals in the electric cell are used up, the electric cell stop producing electricity. Ordinary electric cells cannot be recharged. The batteries are connected in such a way that electricity flow of electrons runs between the positive and negative electrodes of the battery. The batteries rest atop a small spring that is connected to a contact strip. The contact strip runs down the length of the battery case and makes contact with one side of the switch.

There is another flat contact strip on the other side of the switch, which runs to the lamp light bulb , providing an electrical connection. There is another part connected to the lamp that makes contact with the positive electrode of the top battery, thus completing the circuit to the lamp and completing the generation of electricity.

When activated by electricity, the tungsten filament or LED in the lamp begins to glow, producing light that is visible. This light reflects off of the reflector that is positioned around the lamp. The reflector redirects the light rays from the lamp, creating a steady beam of light, which is the light you see emitting from the flashlight.

A clear lens covers the lamp on your flashlight so that the glass on the lamp does not get broken. When the flashlight switch is then pushed into the OFF position, the two contact strips are physically moved apart and the path for the electrical current is broken, thus ending the production of light, and turning your flashlight off. All of the above parts must be connected and in place in order for the portable flashlight to work. Otherwise, you have an open circuit and the electricity will not flow.

How Do Flashlights Work?